The 1954 chevy and gmc bumper filler splash panels (whatever their specific name is not sure but I think that’s what you are asking about) are specific to that year only and are unique to each truck
I recall checking around for the gmc 54 one and it was not reproduced but many places incorrectly listed that part as 47-54.
Maybe the Chevy one is more in demand and reproduced.
-s
